Withdraw NFT

Withdraw Loopring L2 NFT to Ethereum L1

When token is not deployed the fee is different:

deployInWithdraw: tokenInfo?.deploymentStatus === DEPLOYMENT_STATUS.NOT_DEPLOYED

Step 1: Get Account

Prepare Layer 2 account. Retrieve account information.

const {accInfo} = await LoopringAPI.exchangeAPI.getAccount({
  owner: LOOPRING_EXPORTED_ACCOUNT.address,
});
console.log("accInfo:", accInfo);

Step 2: Get eddsaKey

Generate EdDSA key.

const eddsaKey = await signatureKeyPairMock(accInfo);
console.log("eddsaKey:", eddsaKey.sk);

Step 3: Get apiKey

Retrieve the account's API key.

const {apiKey} = await LoopringAPI.userAPI.getUserApiKey(
  {
    accountId: accInfo.accountId,
  },
  eddsaKey.sk
);
console.log("apiKey:", apiKey);

Step 4: Get storageId

Get NFT tokenId storageId

const storageId = await LoopringAPI.userAPI.getNextStorageId(
  {
    accountId: accInfo.accountId,
    sellTokenId: LOOPRING_EXPORTED_ACCOUNT.nftTokenId,
  },
  apiKey
);
console.log("storageId:", storageId);

//Step 5. getUserNFTBalances
const {userNFTBalances} = await LoopringAPI.userAPI.getUserNFTBalances(
  {accountId: LOOPRING_EXPORTED_ACCOUNT.accountId},
  apiKey
);
const tokenInfo = userNFTBalances.find(
  (item) =>
    item.tokenAddress?.toLowerCase() ===
    LOOPRING_EXPORTED_ACCOUNT.nftTokenAddress.toLowerCase() &&
    item.nftId &&
    web3.utils.hexToNumberString(item.nftId) ===
    LOOPRING_EXPORTED_ACCOUNT.nftTokenId.toString()
);

Step 5: Withdraw fee

Get withdrawal fee.

If the tokenAddress hasn't been deployed, deployInWithdraw set to true will retrieve the deployment fee plus withdrawal fee.

If the tokenAddress is deployed, deployInWithdraw set to true will return withdrawal fee.

const fee = await LoopringAPI.userAPI.getNFTOffchainFeeAmt(
  {
    accountId: accInfo.accountId,
    requestType: sdk.OffchainNFTFeeReqType.NFT_WITHDRAWAL,
    tokenAddress: LOOPRING_EXPORTED_ACCOUNT.nftTokenAddress,
    deployInWithdraw:
      tokenInfo?.deploymentStatus === DEPLOYMENT_STATUS.NOT_DEPLOYED, // when token is not deploy the fee is diff
  },
  apiKey
);
console.log("fee:", fee);

Step 6: Withdraw

const response = await LoopringAPI.userAPI.submitNFTWithdraw({
  request: {
    exchange: LOOPRING_EXPORTED_ACCOUNT.exchangeAddress,
    accountId: LOOPRING_EXPORTED_ACCOUNT.accountId,
    counterFactualInfo: undefined,
    hashApproved: "",
    maxFee: {
      tokenId: TOKEN_INFO.tokenMap["LRC"].tokenId,
      amount: fee.fees["LRC"].fee ?? "9400000000000000000",
    },
    minGas: 0,
    owner: LOOPRING_EXPORTED_ACCOUNT.address,
    to: LOOPRING_EXPORTED_ACCOUNT.address,
    storageId: 0,
    token: {
      tokenId: LOOPRING_EXPORTED_ACCOUNT.nftTokenId,
      nftData: LOOPRING_EXPORTED_ACCOUNT.nftData,
      amount: "1",
    },
    validUntil: 0,
  },
  web3,
  chainId: sdk.ChainId.GOERLI,
  walletType: sdk.ConnectorNames.MetaMask,
  eddsaKey: eddsaKey.sk,
  apiKey,
});
console.log("response:", response);

Congratulations! You have just withdrawn your NFT to Layer 1 from Loopring Layer 2!